for the sake of experimenting with kernel debugging, i'm still
trying to build a git-level kernel for my fully-updated f11 x86_64
laptop, and the major stumbling block is getting proper 1280x800 video
with my radeon driver.
lspci shows me:
01:05.0 VGA compatible controller: ATI Technologies Inc RS690M [Radeon
X1200 Series]
and my xorg.conf consists of nothing more than:
=====
Section "ServerFlags"
Option "DontZap" "false"
EndSection
Section "Device"
Identifier "Videocard0"
Driver "radeon"
Option "AccelMethod" "XAA"
EndSection
=====
and here's where the fun starts.
if i boot under my 2.6.29.5-191.fc11.x86_64 kernel, video works fine
at full 1280x800. buried way down in /var/log/Xorg.0.log is:
...
(II) RADEON(0): Output: HDMI-0, Detected Monitor Type: 0
(II) RADEON(0): EDID for output HDMI-0
(II) RADEON(0): Output: VGA-0, Detected Monitor Type: 0
Dac detection success
(II) RADEON(0): EDID for output VGA-0
(II) RADEON(0): Output: LVDS, Detected Monitor Type: 0
(II) RADEON(0): Query for AtomBIOS Get Panel EDID: failed
(II) RADEON(0): Added native panel mode: 1280x800
...
as an alternative, however, i grabbed the config file for this
kernel, the git kernel tree, did "make oldconfig", built a kernel and
booted with it, and that's where things started to go wrong.
first, with the original (fedora) kernel, the boot process is
accompanied by a growing horizontal bar across the bottom of the
screen, with 3 colours -- white, light blue and dark blue -- that
grows from left to right. what is it that causes that bar to appear?
it looks kind of cheap and tacky, is that a boot option that i haven't
noticed?
however, with the git kernel, the on-screen graphic is a stylized
circle in the middle of the screen (actually, the fedora "f" and
infinity symbol) that is slowly filled in with white from the bottom
left to top right. definitely nicer looking -- what's the difference
in the boot process that distinguishes between those two boot
graphics? (i'd never seen that graphic before trying to boot the git
kernel.)
finally, once the git kernel comes up, i have no video, and
/var/log/messages reads:
...
Jul 13 09:22:27 localhost gdm-binary[2416]: WARNING: GdmDisplay: display lasted 0.455812 seconds
Jul 13 09:22:28 localhost kernel: i2c-adapter i2c-1: unable to read EDID block.
Jul 13 09:22:28 localhost kernel: radeon 0000:01:05.0: LVDS-1: no EDID data
Jul 13 09:22:28 localhost kernel: i2c-adapter i2c-1: unable to read EDID block.
Jul 13 09:22:28 localhost kernel: radeon 0000:01:05.0: LVDS-1: no EDID data
Jul 13 09:22:28 localhost kernel: [drm:radeon_cp_getparam_kms] *ERROR* invalid ioctl with kms radeon_cp_getparam_kms
Jul 13 09:22:28 localhost gdm-binary[2416]: WARNING: GdmDisplay: display lasted 0.504048 seconds
Jul 13 09:22:28 localhost gdm-binary[2416]: WARNING: GdmLocalDisplayFactory: maximum number of X display failures reached: check X server log for errors
Jul 13 09:22:28 localhost init: prefdm main process (2416) terminated with status 1
Jul 13 09:22:28 localhost init: prefdm main process ended, respawning
Jul 13 09:22:28 localhost init: prefdm respawning too fast, stopped
...
so ... any hints? what in a configured kernel or module is
responsible for extracting the EDID from a display, as i'm suspecting
that that's the part that's going bad in the git kernel.
rday
--
========================================================================
Robert P. J. Day Waterloo, Ontario, CANADA
Linux Consulting, Training and Annoying Kernel Pedantry.
Web page: http://crashcourse.ca
Twitter: http://twitter.com/rpjday
"Kernel Newbie Corner" column @ linux.com: http://cli.gs/WG6WYX
========================================================================
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