Hello,
I don't have exactly same problem, but I found some problems with xorg
when I switch user between openned sessions:
PROBLEM: I have session with 1600x1050 and switch to another user's
session that was previously set with same 1600x1050 resolution. But when
I switch to this session, the screen gets 1280x1024 and for some reason
the size of the session is very very wrong (it is bigger than the screen
resolution and I can't move or click most of the things so I have to
restart all Xorg).
WORKAROUND: Fortunately I have found some way to resolv it in a tricky way:
Change resolution file name with your resolution file.
1-Install get-edid command: sudo apt-get install read-edid
2-Create a bin file with edid information: sudo get-edid > 1600x1050.bin
3-Create a folder to store this file: sudo mkdir /lib/firmware/edid
4-Copy the file: sudo cp 1600x1050.bin
4-Edit grub to edit linux command to load this file in kms:
-sudo editor /etc/default/grub
-Edit line:
RUB_CMDLINE_LINUX_DEFAULT="drm_kms_helper.edid_firmware=edid/1600x1050.bin
quiet"
Change your name.bin file.
-sudo update-grub
5-Reboot and test.
For some reason it worked for me very well.
I have this card and driver:
fglrxinfo
display: :0 screen: 0
OpenGL vendor string: Advanced Micro Devices, Inc.
OpenGL renderer string: AMD Radeon HD 6450
OpenGL version string: 4.2.12002 Compatibility Profile Context 9.012
My edid information file is:
command: #parse-edid < 1600x1050.bin
parse-edid: parse-edid version 2.0.0
parse-edid: EDID checksum passed.
# EDID version 1 revision 3
Section "Monitor"
# Block type: 2:0 3:fc
Identifier "22T41-H-AN"
VendorName "KTC"
ModelName "22T41-H-AN"
# Block type: 2:0 3:fc
# Block type: 2:0 3:fd
HorizSync 15-68
VertRefresh 49-61
# Max dot clock (video bandwidth) 150 MHz
# DPMS capabilities: Active off:no Suspend:no Standby:no
Mode "1280x720" # vfreq 60.000Hz, hfreq 45.000kHz
DotClock 74.250000
HTimings 1280 1390 1430 1650
VTimings 720 725 730 750
Flags "+HSync" "+VSync"
EndMode
Mode "1680x1050" # vfreq 59.883Hz, hfreq 64.674kHz
DotClock 119.000000
HTimings 1680 1728 1760 1840
VTimings 1050 1053 1059 1080
Flags "-HSync" "+VSync"
EndMode
# Block type: 2:0 3:fc
# Block type: 2:0 3:fd
EndSection
kernel.log:
2139 Oct 2 21:45:06 dans679-computer kernel: [ 0.000000] Kernel command
line: BOOT_IMAGE=/boot/vmlinuz-3.8.0-30-generic root=UUID=939b3111-4906-
46ae-9ad7-7faa783d490d ro drm_kms_helper.edid_firmware=edid/1600x1050.bin quiet
I was looking for other bug report similar in launchpad, but still
looking for the correct one. I would like find a user with same problem
I had, because I think this problems affects many things in KMS (Kernel
mode switch), not just switching between user session, also games in
full screen with different resolution and others things.
It is very hard to find the correct way to report this issue, I would
like to have some help with some Xorg/Kernel team.
I think this could be fixed in some low level, but could be also fixed
with this kind of workaround in some easier way for users: For example
adding some script that test if edid is detected or not, and asking the
user if he liked to let script get the edid info and parse it to the
kernel command, then ask if it was working fine and if the user wants to
keep these settings.
Hope it could help your issue too.
Cheers,
Pablo.
** Attachment added: "my edid file with information used"
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/579292/+attachment/3856530/+files/1600x1050.bin
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https://bugs.launchpad.net/bugs/579292
Title:
Switch of user causes display problems
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