On May 7, 2011, Thomas Fjellstrom wrote:
I just switched to using HDMI with my media center, and its causing a 30+ second delay in the screen turning on, as well as a 7 second delay in the X startup when it tries to fetch the EDID information. Basically I don't get any picture at all once KMS initializes until after X has been up a few seconds.
The odd thing is the monitor seems to think something is going on, since it doesn't go to sleep or display its "No Signal" OSD, but just after X starts up, it pops up the "Input detected/switched" OSD, and the picture appears.
The bios, grub2 (in both text mode and graphics mode), and the initial linux kernel messages all display fine and immediately. Its only once KMS and radeondrmfb initializes that there's a problem (at least till X starts up).
I've just built with a vanila 2.6.38.4 kernel from the stable git repo, and have played with some EDID settings, trying to disable edid where I could thinking thats what caused the problem. That doesn't seem to be the case though. I also tried playing with the video= kernel option, trying to force disable VGA-1, and set a static mode for HDMI-A-1, but if I try, it seems to force disable HDMI-A-1 instead of force the mode.
With a DVI-D cable instead, the problem goes away.
Attached are the dmesg and xorg.log files for the latest boot with HDMI (no video= parameter, and EDID enabled, most settings at defaults).
What exactly would cause this, and is there a way I can fix it?
I've been playing around with it more, and got it to not blank the screen after KMS init, /once/. So far no luck repeating that success.
I've tried late, and early kms init, and currently have the radeon module and firmware compiled into the kernel. Boot times at least are fairly decent, about 8-10s till X starts, but about 25-35s till anything shows up.
Some strangeness, I have the kernel set to force the hdmi output to on, with a very specific mode, that X tends to like, the vga port is forced disabled. X is set to ignore EDID, and also set to that specific mode that it tends to auto set itself. Regardless X still wants to pause for 7s 2-3 times while processing EDID info.
I've attached the new dmesg and xorg logs from the latest attempts.
Note, this only happens with KMS, with HDMI. disabling KMS, or using DVI makes the problem go away. Even grub's own graphical mode works fine, its only once KMS inits that things go bad, and its not till after X is up for a few seconds that something displays on my screen.