Description of problem:
Since kernel 3.9 booting with an LVDS radeon from EFI causes the laptop display to go black. As background, this laptop is a dual gpu with radeon and intel graphics. Booting to the intel graphics I have a working display and backlight.
Booting to the radeon, after systemd output is complete, as Xorg starts the display fades to black and cannot be restored.
Checking the brightness from the kernel (both brightness and actual_brightness) I can see these are both set to 255 (max).
There are no errors in Xorg.0.log, and in fact an external display can be connected and operates correctly.
There are no errors in dmesg.
Gui tools like gnome power manager appear to report that the backlight cannot be changed at all.
Any ideas on where to go from here?
plymouth does not display. Pressing esc shows dmesg output, and pressing escape again leaves dmesg display but stops updating. Esc again goes back to dmesg output.
Should mention kernel version is 3.9.5-301.fc19.x86_64
Dmesg of a boot (That fades to black) is
Jun 27 00:35:18 franky kernel: [ 3.465498] [drm] radeon kernel modesetting enabled.
Jun 27 00:35:18 franky kernel: [ 3.466823] fb: conflicting fb hw usage radeondrmfb vs EFI VGA - removing generic driver
Jun 27 00:35:18 franky kernel: [ 3.765783] radeon 0000:01:00.0: Invalid ROM contents
Jun 27 00:35:18 franky kernel: [ 3.766627] radeon 0000:01:00.0: Invalid ROM contents
Jun 27 00:35:18 franky kernel: [ 3.772134] radeon 0000:01:00.0: VRAM: 1024M 0x0000000000000000 - 0x000000003FFFFFFF (1024M used)
Jun 27 00:35:18 franky kernel: [ 3.772912] radeon 0000:01:00.0: GTT: 512M 0x0000000040000000 - 0x000000005FFFFFFF
Jun 27 00:35:18 franky kernel: [ 3.777745] [drm] radeon: 1024M of VRAM memory ready
Jun 27 00:35:18 franky kernel: [ 3.777745] [drm] radeon: 512M of GTT memory ready.
Jun 27 00:35:18 franky kernel: [ 3.777817] radeon 0000:01:00.0: radeon: using MSI.
Jun 27 00:35:18 franky kernel: [ 3.777851] [drm] radeon: irq initialized.
Jun 27 00:35:18 franky kernel: [ 3.781373] radeon 0000:01:00.0: WB enabled
Jun 27 00:35:18 franky kernel: [ 3.781375] radeon 0000:01:00.0: fence driver on ring 0 use gpu addr 0x0000000040000c00 and cpu addr 0xffff8804532e9c00
Jun 27 00:35:18 franky kernel: [ 3.781377] radeon 0000:01:00.0: fence driver on ring 3 use gpu addr 0x0000000040000c0c and cpu addr 0xffff8804532e9c0c
Jun 27 00:35:18 franky kernel: [ 3.849681] [drm] radeon atom DIG backlight initialized
Jun 27 00:35:18 franky kernel: [ 3.873088] [drm] radeon: power management initialized
Jun 27 00:35:18 franky kernel: [ 4.132484] fbcon: radeondrmfb (fb1) is primary device
Jun 27 00:35:18 franky kernel: [ 4.597725] radeon 0000:01:00.0: fb1: radeondrmfb frame buffer device
Jun 27 00:35:18 franky kernel: [ 4.597816] [drm] Initialized radeon 2.30.0 20080528 for 0000:01:00.0 on minor 1
I have a Macbook Pro 8,2 with Intel and AMD Radeon HD 6750M and I'm not having this problem. I'm not getting plymouth but that may be because I've installed on SSD and the boot time is quite fast, less than 10 seconds to gdm/login.
But I can't tell whether the radeon or intel graphics are being used.
I have the 8,2 with 6770m.
Do you have any lines in grub2 like (outb 0x7**). If so, you are likely on the intel GPU. check Xorg.0.log for what display you are using.
Also, I have SSD also, but same issue. I am using luks, but I don't think that it makes a difference.
I've made no changes from defaults regarding grub, so it has what anaconda and grub2-mkconfig normally produce.
Created attachment 767216 [details]
Created attachment 767217 [details]
Created attachment 767218 [details]
I do get weird artifacts over the entire display after the grub menu, during the time I'd expect to see plymouth. But it clears up once I'm at gdm/login window. Upon logging in, perhaps 5% of the display has weird artifacts, but they clear up. I haven't really hammered on this with many apps so I don't know how stable the environment is, but at least using Firefox it remains stable. The display is the built-in display only, no external is connected.
Created attachment 767223 [details]
Yep, you are definitely on the radeon.
So there are certainly problems with the radeon but perhaps the issues we are experiencing are different either because:
A) We have different GPUs
B) They are different issues
C) Some other influence
Either way, any debugging information that is needed I can provide.
Created attachment 767246 [details]
xorg has a -logverbose 3 default, that can be changed to something higher but I haven't yet figured out how to do this. When I switch to the debug kernel, I get a possible recursive locking detected message related to Xorg, drm and intel. So it may be useful to either use the debug kernel, and/org do a sysrq-d if you're also getting locks.
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