obsolete driver, closing
** Changed in: xserver-xorg-video-psb (Ubuntu)
Status: Confirmed => Won't Fix
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Title:
Precise GMA500 screen
The flicker problem on 14.04 is connected to the gma500_gfx.ko kernel module.
Someone named pmarques has already identified that the pixel clock is too low,
and hopefully he’s working on it:
https://bugs.freedesktop.org/show_bug.cgi?id=78562
** Bug watch added: freedesktop.org Bugzilla #78562
I have an ASUS Eee PC 1101HA.
Aside from the Atom Z520 processor it uses a GMA500 embedded graphics card
which is part of the SCH US15W chipset, also known as Poulsbo.
The interesting thing is: Ubuntu 12.04.4 LTS works out of the box and is
reasonably fast.
Now I installed Ubuntu 14.04 LTS and
I have already tried all possible variants changing the screen mode via
xrandr, including the Modeline ( Modeline 1366x768 74.06 1366
1429 1557 1663 768 768 769 775 -HSync +VSync) , that is proposed in
the 10-emgd.conf, which was made especially for Vaio X.
Without changing anything,
Is it somehow possible to remove the flickering? In earlier versions
(e.g. 9.10) the graphics are without this flickering out of the box.
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Title:
Updating my last post
1) Resolution problem
The screen.conf workaround posted before seems to be completely
reliable. No more resolution problems until now.
2) Brightness control to reduce flickering
As a matter of fact 'pci=noacpi' is not necessary. It is enough to pass
this parameter from
Flickering and initial screen corrpution also affects VAIO-P (second
generation), such as my VPCP11S1E
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Title:
Precise GMA500 screen resolution
I can confirm this bug with the same machine: non-native resolution and
flickering, after installing the beta2 this morning.
A workaround for installation is to resort to the alternate-CD.
Rebooting after finishing installion ends in black screen, but changing
then into a console w/ CTL+ALT+F1
More tests:
I've been able to reproduce the random behavior reported by @Svante.
Sometimes the native resolution mode of the monitor (1366x768) is
recognized, sometimes it does not, and the system falls to 1024x768.
As a workaround I've created a typical screen.conf section in
On April 4 the screen resolution is still an issue. Some 50% of the
times the system starts up with 1024x768. I haven't tried again since.
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Title:
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: xserver-xorg-video-psb (Ubuntu)
Status: New = Confirmed
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** Package changed: xorg-server (Ubuntu) = xserver-xorg-video-psb
(Ubuntu)
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Title:
Precise GMA500 screen resolution and flicker
To manage
** Attachment added: 2012-04-03 10.17.11.jpg
https://bugs.launchpad.net/bugs/972294/+attachment/2994973/+files/2012-04-03%2010.17.11.jpg
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** Package changed: gnome-settings-daemon (Ubuntu) = xorg-server
(Ubuntu)
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Title:
Precise GMA500 screen resolution and flicker
To manage
All as described happened the first time i ran the Try Ubuntu. I shut
everything down and did everything exactly the same a second time to
confirm and write this bug report.
Afterwards I have tried 2 more times (also exactly the same) and the
screen resolution worked both times (nolonger an
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