Bug 62246

I have a HP Envy 14 laptop, which has switchable graphics between:

00:02.0 VGA compatible controller: Intel Corporation Core Processor Integrated Graphics Controller (rev 02)
01:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI Madison [Radeon HD 5000M Series] (rev ff)

This used to work (I'm not using it very often, so I don't know which kernel
version broke it), and I think it caused total kernel hang in 3.0 till 3.3 or
so.  Not it "works" in the sense that when a HDMI cable is connected, I get a
picture on the connected monitor.  But the primary display output, LVDS-2, stays black.

Here's the relevant dmesg parts:

agpgart-intel 0000:00:00.0: Intel HD Graphics Chipset
agpgart-intel 0000:00:00.0: detected gtt size: 2097152K total, 262144K mappable
agpgart-intel 0000:00:00.0: detected 32768K stolen memory
agpgart-intel 0000:00:00.0: AGP aperture is 256M @ 0xb0000000
[drm] Initialized drm 1.1.0 20060810
i915 0000:00:02.0: setting latency timer to 64
i915 0000:00:02.0: irq 40 for MSI/MSI-X
[drm] Supports vblank timestamp caching Rev 1 (10.10.2010).
[drm] Driver supports precise vblank timestamp query.
vgaarb: device changed decodes: PCI:0000:00:02.0,olddecodes=io+mem,decodes=none:owns=io+mem
vgaarb: transferring owner from PCI:0000:00:02.0 to PCI:0000:01:00.0
ACPI: Deprecated procfs I/F for battery is loaded, please retry with CONFIG_ACPI_PROCFS_POWER cleared
ACPI: Battery Slot [BAT0] (battery present)
ACPI: Deprecated procfs I/F for battery is loaded, please retry with CONFIG_ACPI_PROCFS_POWER cleared
ACPI: Battery Slot [BAT1] (battery absent)
[drm] GMBUS [i915 gmbus vga] timed out, falling back to bit banging on pin 2
fbcon: inteldrmfb (fb0) is primary device
Console: switching to colour frame buffer device 200x56
i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
i915 0000:00:02.0: registered panic notifier
[Firmware Bug]: ACPI: No _BQC method, cannot determine initial brightness
acpi device:01: registered as cooling_device5
ACPI: Video Device [GFX0] (multi-head: yes  rom: no  post: no)
input: Video Bus as /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/LNXVIDEO:00/input/input3
[Firmware Bug]: ACPI(PEGP) defines _DOD but not _DOS
acpi device:0a: registered as cooling_device6
ACPI: Video Device [PEGP] (multi-head: yes  rom: no  post: no)
input: Video Bus as /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/device:08/LNXVIDEO:01/input/input4
[drm] Initialized i915 1.6.0 20080730 for 0000:00:02.0 on minor 0

[drm] radeon defaulting to kernel modesetting.
[drm] radeon kernel modesetting enabled.
VGA switcheroo: detected switching method \_SB_.PCI0.GFX0.ATPX handle
radeon 0000:01:00.0: enabling device (0000 -> 0003)
[drm] initializing kernel modesetting (REDWOOD 0x1002:0x68C1 0x103C:0x1436).
[drm] register mmio base: 0xC4400000
[drm] register mmio size: 131072
vga_switcheroo: enabled
ATPX version 1
ATOM BIOS: MADISON
radeon 0000:01:00.0: VRAM: 1024M 0x0000000000000000 - 0x000000003FFFFFFF (1024M used)
radeon 0000:01:00.0: GTT: 512M 0x0000000040000000 - 0x000000005FFFFFFF
mtrr: no more MTRRs available
[drm] Detected VRAM RAM=1024M, BAR=256M
[drm] RAM width 128bits DDR
[TTM] Zone  kernel: Available graphics memory: 3980934 kiB
[TTM] Zone   dma32: Available graphics memory: 2097152 kiB
[TTM] Initializing pool allocator
[TTM] Initializing DMA pool allocator
[drm] radeon: 1024M of VRAM memory ready
[drm] radeon: 512M of GTT memory ready.
[drm] Supports vblank timestamp caching Rev 1 (10.10.2010).
[drm] Driver supports precise vblank timestamp query.
radeon 0000:01:00.0: irq 45 for MSI/MSI-X
radeon 0000:01:00.0: radeon: using MSI.
[drm] radeon: irq initialized.
[drm] GART: num cpu pages 131072, num gpu pages 131072
[drm] probing gen 2 caps for device 8086:45 = 1/0
[drm] Loading REDWOOD Microcode
[drm] PCIE GART of 512M enabled (table at 0x0000000000040000).
radeon 0000:01:00.0: WB enabled
radeon 0000:01:00.0: fence driver on ring 0 use gpu addr 0x0000000040000c00 and cpu addr 0xffff880251324c00
radeon 0000:01:00.0: fence driver on ring 3 use gpu addr 0x0000000040000c0c and cpu addr 0xffff880251324c0c
radeon 0000:01:00.0: enabling bus mastering
[drm] ring test on 0 succeeded in 1 usecs
[drm] ring test on 3 succeeded in 1 usecs
[drm] ib test on ring 0 succeeded in 0 usecs
[drm] ib test on ring 3 succeeded in 0 usecs
[drm] radeon atom DIG backlight initialized
[drm] Radeon Display Connectors
[drm] Connector 0:
[drm]   LVDS-2
[drm]   DDC: 0x6560 0x6560 0x6564 0x6564 0x6568 0x6568 0x656c 0x656c
[drm]   Encoders:
[drm]     LCD1: INTERNAL_UNIPHY
[drm] Connector 1:
[drm]   DP-1
[drm]   HPD2
[drm]   DDC: 0x6440 0x6440 0x6444 0x6444 0x6448 0x6448 0x644c 0x644c
[drm]   Encoders:
[drm]     DFP1: INTERNAL_UNIPHY1
[drm] Connector 2:
[drm]   HDMI-A-1
[drm]   HPD1
[drm]   DDC: 0x6430 0x6430 0x6434 0x6434 0x6438 0x6438 0x643c 0x643c
[drm]   Encoders:
[drm]     DFP2: INTERNAL_UNIPHY1
[drm] Internal thermal controller with fan control
[drm] radeon: power management initialized
[drm] fb mappable at 0xA0142000
[drm] vram apper at 0xA0000000
[drm] size 5787648
[drm] fb depth is 24
[drm]    pitch is 6400
radeon 0000:01:00.0: fb1: radeondrmfb frame buffer device
[drm] Initialized radeon 2.29.0 20080528 for 0000:01:00.0 on minor 1

When I start the intel framebuffer, the display is also black, but I
found out that that is just the brightness set to 0, so I wrote a little
too that writes to /sys/class/backlight/acpi_video0/brightness to set a
sensible brightness.

When the radeon screen stayed black, I assumed the same problem, so I
changed my tool to also write to
/sys/class/backlight/acpi_video1/brightness, but this does not help.

To check whether this was related to VGA switcheroo interactions, I compiled a kernel with no Intel driver in it and insmod'ed the radeon module.  This time the LVDS display stayed in text mode and "hung" in the sense that the text did not continue scrolling.

I something is attacked on the HDMI output, that display gets a text console when I insmod radeon.

When I start X, the LVDS screen still stays broken, but the console disappears from the HDMI screen, and the laptop appears to hang.  My default setup within X is to have an xterm, so I moved my mouse into that xterm  (without seeing any of it) and started a shell script that uses xrandr to set up the second display, but nothing happened.  It felt as if the Intel driver still felt responsible for LVDS.

Since I'm using X in non-radeon mode all the time, I have no Xorg.log left from my radeon testing.  I can tell you though what was in it.  No (EE) lines.  I originally used X.org 1.12.3, then switched to 1.14 to see if that would make the problem disappear.  I tried the latest release versions of libdrm and xf86-intel-radeon but when that did not work, I upgraded to the git versions of both.  No improvement.

I can try again tonight at home and produce an Xorg.0.log for you.