答复: 答复: 答复: 答复: 答复: My laptop can't resume from suspend.

[Anthony Jenkins]

On 08/26/2014 21:20, Adrian Chadd wrote:
> What's the thing that needs porting?
>
>
>
> -a
>
I've been eyeballing these links:

http://h30434.www3.hp.com/t5/Notebook-Display-and-Video/Envy-14-display-backlight-controls-not-working-under-Linux/td-p/289176
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/568611/

The Linux kernel apparently has backlight handlers and the ACPI kernel can either use the ACPI method or some "vendor" method (I think those are the handlers).  I get a "Cannot find a backlight controller" error when I boot, and that code is in the radeon drm2 driver (sys/dev/drm2/radeon/radeon_acpi.c).

info: [drm] Radeon Display Connectors
info: [drm] Connector 0:
info: [drm]   LVDS-1
info: [drm]   HPD1
info: [drm]   DDC: 0x6530 0x6530 0x6534 0x6534 0x6538 0x6538 0x653c 0x653c
info: [drm]   Encoders:
info: [drm]     LCD1: INTERNAL_UNIPHY2
info: [drm]     LCD1: TRAVIS
info: [drm] Connector 1:
info: [drm]   HDMI-A-1
info: [drm]   HPD3
info: [drm]   DDC: 0x6550 0x6550 0x6554 0x6554 0x6558 0x6558 0x655c 0x655c
info: [drm]   Encoders:
info: [drm]     DFP1: INTERNAL_UNIPHY
info: [drm] Internal thermal controller without fan control
info: [drm] radeon: power management initialized
info: [drm] fb mappable at 0xE114C000
info: [drm] vram apper at 0xE0000000
info: [drm] size 4325376
info: [drm] fb depth is 24
info: [drm]    pitch is 5632
fbd0 on drmn0
VT: Replacing driver "vga" with new "fb".
error: [drm:pid0:radeon_acpi_init] *ERROR* Trying encoder 0xfffff80007465400...
error: [drm:pid0:radeon_acpi_init] *ERROR*  Found LCD support.
error: [drm:pid0:radeon_acpi_init] *ERROR* Trying encoder 0xfffff80007465000...
error: [drm:pid0:radeon_acpi_init] *ERROR* Trying encoder 0xfffff80007329e00...
error: [drm:pid0:radeon_acpi_init] *ERROR* Cannot find a backlight controller
info: [drm] Initialized radeon 2.29.0 20080528
vgapci0: Boot video device

(I added the *ERROR* lines to debug).  It looks like the Linux changes mentioned in the 2nd link would go in there...but I gave up looking at it until I had more spare time.

Anthony