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xfree86: fbdevhw: fix pci detection on recent Linux

Enrico Weigelt, metux IT consult requested to merge metux/xserver:submit/fix-fbdev-pci-detect into master

Proxy'ing for <Tj tj.iam.tj@proton.me>

Linux kernel v6.9 has changed the symlink to point to the parent device. This breaks fbdev_open() detection logic. Change it to use the subsystem symlink instead which will remain stable.

Kernel v6.8:

[ 14.067] (II) fbdev_open() sysfs_path=/sys/class/graphics/fb0 [ 14.067] (II) fbdev_open() buf=../../devices/platform/vesa-framebuffer.0/graphics/fb0

Kernel v6.9:

[ 15.609] (II) fbdev_open() sysfs_path=/sys/class/graphics/fb0 [ 15.609] (II) fbdev_open() buf=../../devices/pci0000:00/0000:00:01.0/vesa-framebuffer.0/graphics/fb0

Originally found in automated Debian ISO QA testing [0] and confirmed in Linux [1].

Tested on kernels v6.9.7 and v6.8.12

[0] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1075713 [1] https://lore.kernel.org/lkml/lLyvPFC_APGHNfyGNHRpQy5izBikkaTPOpHooZIT3fFAoJPquSI31ZMueA99XTdr8ysir3X7O7IMdc6za-0m79vr_claeparHhoRouVgHOI=@proton.me/

Fixes: #1714 Signed-off-by: Tj tj.iam.tj@proton.me Reviewed-by: Thomas Zimmermann tzimmermann@suse.de Reviewed-by: Enrico Weigelt, metux IT consult info@metux.net

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