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[Bug 356381] Re: Kernel High Memory Support <64GB> incompatible with intel video UXA

To: ubuntu-x-swat@xxxxxxxxxxxxxxxxxxx
From: VladNistor <vladnistor@xxxxxxxxx>
Date: Sun, 17 May 2009 07:20:10 -0000
Reply-to: Bug 356381 <356381@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

I am now testing Karmic Alpha 1 and the problem is still here.

UXA works on kernel 2.6.30-5-generic but not 2.6.30-5-server which are
available on Karmic.

This bug is important because as support for EXA will be dropped we will
all be using UXA which means everyone who uses -server kernels or has
64GB mem option selected will be unable to do so.

** Bug watch added: freedesktop.org Bugzilla #17993
https://bugs.freedesktop.org/show_bug.cgi?id=17993

** Also affects: xserver-xorg-video-intel via
https://bugs.freedesktop.org/show_bug.cgi?id=17993
Importance: Unknown
Status: Unknown

** Summary changed:

- Kernel High Memory Support <64GB> incompatible with intel video UXA
+ Kernel High Memory Support 64GB [PAE] incompatible with intel video UXA

** Description changed:

- In Jaunty with Intel GM965 video, trying to add Option "AccelMethod"
- "UXA" to /etc/X11/xorg.conf results in a system freeze with a black
- screen when X starts if you use the -server kernel. (CapsLock doesn't
- work, the magic SysRq works). Specifically, I was using linux-
- image-2.6.28-11-server version 2.6.28-11.40. The -generic server works
- (more or less, this is not the place to complain about other UXA bugs).
+ X hangs on startup, giving a black screen, when kernel has
+ CONFIG_HIGHMEM64G, which means every -server kernel compiled by Ubuntu.
+
+ [Original Bug Report]
+ In Jaunty with Intel GM965 video, trying to add Option "AccelMethod" "UXA" to /etc/X11/xorg.conf results in a system freeze with a black screen when X starts if you use the -server kernel. (CapsLock doesn't work, the magic SysRq works). Specifically, I was using linux-image-2.6.28-11-server version 2.6.28-11.40. The -generic server works (more or less, this is not the place to complain about other UXA bugs).

Why is this important (i.e. why would anyone run the -server kernel on a
desktop)? This is why:

If a user installs ubuntu-xen-desktop (which is a package for running
Xen "on desktops", so a natural thing to install on a desktop), apt
pulls in linux-image-server as a dependency. GRUB then decides that the
-server kernel is preferred to the regular -generic and boots into it
(which is weird, but okay, maybe Xen needs that?).

I had to uninstall the -server kernel (and ubuntu-xen-desktop) as a
workaround.

ProblemType: Bug
Architecture: i386
DistroRelease: Ubuntu 9.04
MachineType: LENOVO 646655G
Package: linux-image-2.6.28-11-generic 2.6.28-11.40
ProcCmdLine: root=UUID=34a7bfc5-59dc-4d74-a131-45b6ae4663b1 ro quiet splash vga=872
ProcEnviron:
LC_CTYPE=lt_LT.UTF-8
PATH=(custom, user)
LANG=lt_LT.UTF-8
SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.28-11.40-generic
SourcePackage: linux

** Description changed:

X hangs on startup, giving a black screen, when kernel has
CONFIG_HIGHMEM64G, which means every -server kernel compiled by Ubuntu.
+ The only work-around is to use a -generic kernel which doesn't see
+ anything above 3 GB RAM.
+
+ This bug is important because as support for EXA will be dropped we will
+ all be using UXA which means everyone who uses -server kernels or has
+ 64GB mem option selected will be unable to do so.

[Original Bug Report]
In Jaunty with Intel GM965 video, trying to add Option "AccelMethod" "UXA" to /etc/X11/xorg.conf results in a system freeze with a black screen when X starts if you use the -server kernel. (CapsLock doesn't work, the magic SysRq works). Specifically, I was using linux-image-2.6.28-11-server version 2.6.28-11.40. The -generic server works (more or less, this is not the place to complain about other UXA bugs).

Why is this important (i.e. why would anyone run the -server kernel on a
desktop)? This is why:

I had to uninstall the -server kernel (and ubuntu-xen-desktop) as a
workaround.

--
Kernel High Memory Support 64GB [PAE] incompatible with intel video UXA
https://bugs.launchpad.net/bugs/356381
You received this bug notification because you are a member of Ubuntu-X,
which is the registrant for xf86-video-intel.