radeon inconsistent output names

Alex Deucher alexdeucher at gmail.com
Thu May 8 13:25:12 PDT 2014

On Thu, May 8, 2014 at 3:42 PM, Matthew Monaco <matt at monaco.cx> wrote:
> Hi,
> My HDMI output name (ie the one I use for xrandr) changes between HDMI-0 and
> HDMI-3 from boot to boot. It doesn't toggle back and forth or anything like
> that, it's just random. This makes my xprofile script a pain for setting up my
> displays when I log in.
> I have an i915 which is still enabled in the bios, is the first card, has the
> kernel ttys, and is used for seat0.
> The radeon is used for seat1, and is the one with the issue. Is there are fix
> for this?

I think it will depend on what order the cards are initialized by X
and the kernel.


> 01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Cape
> Verde PRO [Radeon HD 7750] (prog-if 00 [VGA controller])
>         Subsystem: ASUSTeK Computer Inc. Device 0459
>         Flags: bus master, fast devsel, latency 0, IRQ 44
>         Memory at d0000000 (64-bit, prefetchable) [size=256M]
>         Memory at efd00000 (64-bit, non-prefetchable) [size=256K]
>         I/O ports at e000 [size=256]
>         Expansion ROM at efd40000 [disabled] [size=128K]
>         Capabilities: [48] Vendor Specific Information: Len=08 <?>
>         Capabilities: [50] Power Management version 3
>         Capabilities: [58] Express Legacy Endpoint, MSI 00
>         Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+
>         Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1 Len=010 <?>
>         Capabilities: [150] Advanced Error Reporting
>         Capabilities: [270] #19
>         Kernel driver in use: radeon
>         Kernel modules: radeon
> I'm on Linux v3.14.3, and I believe I started noticing this sometime in v3.13.y.
> Also using xorg-server v1.15.1, xrandr v1.4.2, xf86-video-ati 7.3.0.
> Thanks!
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