OESF Portables Forum
Model Specific Forums => Sharp Zaurus => Zaurus - pdaXrom => Topic started by: Laze on November 15, 2004, 09:41:41 am
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Could all the user who are complaing about screen flickering in pdaXrom please try this:
https://www.oesf.org/forums/inde...wtopic=8487&hl= (https://www.oesf.org/forums/index.php?showtopic=8487&hl=)
A bit down in the post..
Be carefull and we don't take any responsibility for broken hardware - allthough it should brake anything..
Edit: Please try different settings until you get the desired result - i had to do 3-4 trys - but now my screen is rock solid and ultra sharp..
Could people please post their values for COM and LCD.
A good way to test for ok results is to rotate screen to "pda mode" and then run dillo and resize to full window. The windows top title should not flicker, have shadows etc.
Quick guide for entering and changing it:
1. Leave gui, bring menu up and exit.
2. Enter reboot at commandline and keep d and m pressed
3. After a while a menu will popup - select with pen and press on "1. Com adj setting."
4. You can use arrows up/down/left/right for chaning values. When you found best settings press on "Update" onscreen.
5. Select "2. LCD Phase Setting" and use same procedure as 4.
6. Now select "Page up" three times and selec "Extra menu" and then "9. Reset".
10. Turn on Zaurus after power off and then try the above "dillo test".
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Just to make it even a bit clearer, it seems that with the Maintenance Menu you can precisely regulate one or more Display parameter. I played a bit with my C860 (which did NOT have the FLICKERING problem) and GOT my flickering thingy ... (then I restored that display parameter to its correct setting).
It seems to be a factory regulation problem, the flickering that some guys got in their zaurus with some OS.
Why is that Laze ? You initialize display in a certain mode (frecuency or whatever) that is NOT the official zaurus rom threshold ? If I correctly recall, from the overclocking program that is included with pdaxrom, couldn't you change more than one "adjustment" ? maybe ram frecuency and/or processor frecuency, even slightly displaced, makes this regulation problem to surface ?
Welp ... I was just wondering
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Sash is looking into it :-)
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Edit: After pressing update and managed to set the com value to 108 (from 116),
the flickering indeed disappear
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I still have the problem. My setting is at 114 and there is still a light flicker, which has been there since day 1. As noted previously, Cacko has no such problem.
Also, if it were a hardware setting issue, I again have to ask why would it happen in pdaXrom and not Cacko? If it's an init issue, then I would think pdaXrom could be modified somehow to init in a similar manner as Cacko. I'm only throwing out thoughts; I have no idea on how this can be fixed.
I will promise you this: If it can be fixed, I guarantee a $100 donation. Not trying to bribe. I plan on doing a $25 donation this week, even though I'm using Cacko. The $100 would be on top of that, because I'd really like to use pdaXrom.
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DaveAnderson - what Zaurus are you using? Could you post some more details - maybe PM me a ICQ or some other IM - then we can maybe try some different things.
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Would everybody please also try:
cat 75 > /proc/driver/w100/fastsysclk
see if this helps...
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I still have the problem. My setting is at 114 and there is still a light flicker, which has been there since day 1. As noted previously, Cacko has no such problem.
It doesn't have to be exactly 114! The actual value depends on your hardware - ex. on one of my Z it was 115, but 122 on another one... Change the value and see, which number removes all flicker...
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Could people please post their values - mine are:
Com: 115
LCD Phase: 4
A good way to test for ok results is to rotate screen to "pda mode" and then run dillo and resize to full window. The windows top title should not flicker, have shadows etc.
Quick guide for entering and changing it:
1. Leave gui, bring menu up and exit.
2. Enter reboot at commandline and keep d and m pressed
3. After a while a menu will popup - select with pen and press on "1. Com adj setting."
4. You can use arrows up/down/left/right for chaning values. When you found best settings press on "Update" onscreen.
5. Select "2. LCD Phase Setting" and use same procedure as 4.
6. Now select "Page up" three times and selec "Extra menu" and then "9. Reset".
10. Turn on Zaurus after power off and then try the above "dillo test".
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I did:
cat > /proc/driver/w100/fastsysclk
75
C-d.
-> Set fastsysclk 75
This makes thing worst :-(
I have flickering on the background of the aterm which I didn't had before.
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Ok the first time I tried the d m method i missed a step, that I also missed in laze little tutorial but that I figured out in the end after setting the COM value,
PRESS THE UPDATE RECTANGLE ON SCREEN !!
My setting was 116 I set it to 108 and
FLICKERING IS GONE!
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The cat 75 > /proc/driver/w100/fastsysclk - doesn't seem to fix some of the problems - and btw. it set back to 100 on C860 when screen is rotated back and forth.
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Com: 114
Phase: 5
I detect a very small flicker in title bar, nothing as bad as most LCD screens though.
Simon.
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My original settings were:
COM: 126
Phase: 0
After tuning:
COM: 116
Phase: 2
Great procedure it really helps the display.
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Wow. I hope this fixes it for me. I won't be able to try until Thursday. If it does, I owe you guys $125!!!
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We look forward to it - btw. don't give up at first - you might need to do several reboots and settings. As i wrote the best way i found for testing was to run Dillo in maximized window in "pda" mode. Hope it works :-)
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I've gotten it fairly close to perfect. However, when I switch to portrait mode, I get shadows. Does this mean I have to keep adjusting?
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Yes - bascially if you get the Portrait mode running - then normal mode should be okay too..
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Chuckle, been away for a while and came back to see this thread. Glad to see that perhaps the 'flickering problem' has a solution ;-)
- Bundabrg
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Hi @all,
What means 'flickering' in your postings?
I use tkcROM and noticed that with dark background there are light stripes going from the right site to the left site of the display, as is the case for osziloskop.
When I switch to max. background light then the flickering is gone or not to see.
Is it that what you mean?
thx for any help!
regards
Dirk
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I think it can best be described as "shivering" and it tends to be visible
on vertical lines such as those on the left side of an aterm/xterm, etc.
Mostly, it occurs on the left side of the display.
It appears to be some sort of timer/timing issue with the driver and
I think it's been investigated and mostly addressed/resolved --
but it takes manual intervention to rememdy.
Scott
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If your settings are wrong it can also seem like a ... doubling up of lines. IE, instead of seeing a line across a screen, you may see a line and a ghost line near it. I got that when I reset my settings.
However, the shimmering is the most common problem, and I've seen in in pdaXrom and in GPE, both X environments.
- Bundabrg
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stock rom(tetsu kernel)
lcd phase 7
com 13
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Can these settings changed be used to remove that ghost lines/image that appear above things? if so which would help it more com or phase?
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Can these settings changed be used to remove that ghost lines/image that appear above things? if so which would help it more com or phase?
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About a year ago I also mentioned the problem I had with ghost lines (Sharp rom). I tried to remove them with com/phase manupilation.. it didn't help me then. While reading this topic today I decided to give it another go and yes .. for the first time I had my Z I got rid of the ugly ghost lines by adjusting the phase from 0 to 7. So adjust phase in case of ghost problems and com in case of screenflickering I would say.
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are the lines/ghosting from the lcd being driven too hard? anyone know? or is it a sync problem? any more details?
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hi, thx for help.. fixed the flickering
C860-OZ3.5.4.1
COM ADJ setting: 105 (was 118)
&
LCD Phase Setting 4
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Hrm, none of the things above seem to work for me It keeps flickering just like before, I cant't see any changes... Today I got my first Zaurus, a C750 and installed U-Boot+pdaXrom on it but noticed the screen was flickering and tried to fix that with the tips above.. Unfortunately that didn't help at all Is there any another way to fix it?
Hrm.. But I've got a question to the devs.. This doesn't seem to occur while it's in portrait mode (or rotated), wouldn't it perhaps be better to just set the new screen size instead of resizing it with its own system functions when the X server starts? [span style=\'font-size:8pt;line-height:100%\']Sorry if that question is stupid, I'm just curious[/span]
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I haven't ever gotten rid of the ghosting on my C3100. I've tried changing the phase, but it remains. Is there anything else I can try?