Red Hat Bugzilla – Bug 505679
[PATCH] Primary video card detection interacts badly with IsolateDevice
Last modified: 2015-02-18 06:59:21 EST
Created attachment 347672 [details]
Patch to fix primary video card detection when IsolateDevice is set
I am using Fedora 11 with xorg-x11-server-Xorg-126.96.36.1991-1.fc11.x86_64.
In the source file xserver/hw/xfree86/common/xf86pciBus.c, the function xf86PciProbe() attempts to discover the video cards in the system and determine which one is the primary (boot) video card. Part of the logic is "if there is only one valid card, it must be primary". However, the functionality of the IsolateDevice config and commandline options is to hide all but one card from xf86PciProbe(). The result is that whenever IsolateDevice is used, the card specified is marked as primary even if it is not the boot card.
I've attached a small patch to change the logic to "if there is only one valid card, and IsolateDevice is not specified, then it must be primary." This solves a problem for me with a dual seat Fedora 11 setup using dual radeon HD cards. The radeonhd driver looks for its copy of the video BIOS in different places depending on whether the card is primary or secondary. So without this patch, when X is run with IsolateDevice on the secondary card, radeonhd looks for the video BIOS in the wrong place, causing failure.
The attached patch, xserver-1.6.1-primary2.patch, depends on being applied after fedora's rewrite of the primary card detection logic, xserver-1.6.0-primary.patch, which is already part of the xorg-x11-server SRPM. So perhaps they should be integrated.
*** Bug 468943 has been marked as a duplicate of this bug. ***
Since this bugzilla report was filed, there have been several major updates in various components of the Xorg system, which may have resolved this issue. Users who have experienced this problem are encouraged to upgrade their system to the latest version of their packages. For packages from updates-testing repository you can use command
yum upgrade --enablerepo='*-updates-testing'
Alternatively, you can also try to test whether this bug is reproducible with the upcoming Fedora 12 distribution by downloading LiveMedia of F12 Beta available at http://alt.fedoraproject.org/pub/alt/nightly-composes/ . By using that you get all the latest packages without need to install anything on your computer. For more information on using LiveMedia take a look at https://fedoraproject.org/wiki/FedoraLiveCD .
Please, if you experience this problem on the up-to-date system, let us now in the comment for this bug, or whether the upgraded system works for you.
If you won't be able to reply in one month, I will have to close this bug as INSUFFICIENT_DATA. Thank you.
[This is a bulk message for all open Fedora Rawhide Xorg-related bugs. I'm adding myself to the CC list for each bug, so I'll see any comments you make after this and do my best to make sure every issue gets proper attention.]
OK, I downloaded the latest Fedora LiveCD, desktop-x86_64-20091104.16.iso. The problem is still present; when using IsolateDevice on the secondary card, the xorg server incorrectly marks the card as a primary card. This confuses at least the radeonhd driver, which I use. So my patch is still required.
Matej, who can look into implementing this patch then?
This bug appears to have been reported against 'rawhide' during the Fedora 12 development cycle.
Changing version to '12'.
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This bug appears to have been reported against 'rawhide' during the Fedora 19 development cycle.
Changing version to '19'.
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cycle bugs. We are very sorry. It will help us with cleanup during Fedora 19 End Of Life. Thank you.)
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