Red Hat Bugzilla – Bug 488843
update broke ATI driver for multiple screens
Last modified: 2009-12-18 03:57:54 EST
Created attachment 334223 [details]
xorg.conf for bigger virtual screen size
Description of problem:
After updating my system, as normal, X stopped working upon reboot. I traced this to me either having a second screen attached to the laptop or by using a xorg.conf that expanded the virtual screen size.
Looking at the diffs of the log files comparing with and without the xorg.conf for a big screen (and while having no second monitor attached) I saw it looks like it has to do with the framebuffer memory size. I went into BIOS and changed the amount of memory for graphics from 32MB to 64MB and also tried 128 MB but both bigger sizes would also break X and this time without the xorg.conf or second monitor.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. boot with nomodeset (KMS is broke on this RS485 system) into runlevel 3
2. use attached xorg.conf to increase virtual screen size (or plug in second monitor)
3. start X
01:05.0 VGA compatible controller: ATI Technologies Inc RS482 [Radeon Xpress 200M]
Created attachment 334224 [details]
log with no second screen and no xorg.conf
Created attachment 334225 [details]
log with no second screen but with xorg.conf_bigscreen
The system works if I disable DRI. I did this after a git bisect pointed to commit 72992668. But talking with Alex this appears to be a GART issue. I tried with the vanilla kernel 126.96.36.199 but it also had this problem.
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