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Bug#838344: linux-image-4.6.0-1-amd64: allow a patch that makes elder radeon cards UltraHD ready

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Package: src:linux
Version: 4.6.4-1
Severity: wishlist
Tags: patch

Here come the patches.

Am 2016-09-20 um 09:16 schrieb Elmar Stellnberger:
> Package: src:linux
> Version: 4.6.4-1
> Severity: wishlist
> Tags: patch
>
> In March I had developed a kernel patch that allows to set the TMDS
> frequency for radeon cards by a new kernel parameter called
> radeon.hdmimhz if the automatically set frequency stays either behind of
> what has been advertised for the card or by what is achievable through
> overclocking. A similar parameter for nvidia/nouveau cards is already
> available somewhat longer. However up to now the patch has not been
> accepted into the mainline kernel simply because radeon developers are
> not encouraged to enable this feature for elder cards by the policy of
> their sponsors. Here are some of my considerations which you may take
> into account when deciding about the acceptance of the patch for Debian
> Stretch:
>
>   * the patch is very simple, just a few lines of code
>   * behaviour of the kernel is not influenced by the patch except when
> the user gives a non-zero value for radeon.hdmimhz
>   * the patch has already wheathered time; the surrounding code has more
> or less remained unchanged since March
>   * long time usage experience is already available at least with the
> radeon R5 230 card as well as different monitors; my personal experience
> with the patch is very good
>   * the patch provides a huge advantage at least for all people who
> still use Core 2 based systems:
>     - elder radeon cards can be made UHD ready
>     - the R5 230 card supported by the patch may be the only one of its
> type that has a single slot height - and it has been sold to me as
> DVI-UltraHD ready; however this feature can not be exploited without the
> kernel patch
>     - newer radeon cards are often incompatible with elder Core 2 systems
>   * at least nouveau developers say that by overclocking your TMDS it
> would rarely be possible to damage a card; a way of proceeding
> considered safe can be read in the linked article
> (https://www.elstel.org/software/hunt-for-4K-UHD-2160p.html.en ; the
> article is no more completely new and it will be updated soon.).
>
>   P.S.: The attached patches are for application at the 4.8.0-rcX
> kernels; however the same patch has also proven to work well for
> 4.6.x/Debian. If you do not want to update 4.6.0-1 then I`d apply for
> inclusion of this patch with the adoption of 4.8.0.
>
> -- System Information:
> Debian Release: stretch/sid
>    APT prefers testing
>    APT policy: (500, 'testing')
> Architecture: amd64 (x86_64)
> Foreign Architectures: i386
>
> Kernel: Linux 4.8.0-rc6+ (SMP w/4 CPU cores)
> Locale: LANG=de_AT.utf8, LC_CTYPE=de_AT.utf8 (charmap=UTF-8)
> Shell: /bin/sh linked to /bin/dash
> Init: systemd (via /run/systemd/system)
>
> Versions of packages linux-image-4.6.0-1-amd64 depends on:
> ii  initramfs-tools [linux-initramfs-tool]  0.125
> ii  kmod                                    22-1.1
> ii  linux-base                              4.4
>
> Versions of packages linux-image-4.6.0-1-amd64 recommends:
> ii  firmware-linux-free  3.4
> pn  irqbalance           <none>
>
> Versions of packages linux-image-4.6.0-1-amd64 suggests:
> pn  debian-kernel-handbook  <none>
> ii  grub-pc                 2.02~beta2-36
> pn  linux-doc-4.6           <none>
>
> Versions of packages linux-image-4.6.0-1-amd64 is related to:
> ii  firmware-amd-graphics     20160110-1
> ii  firmware-atheros          20160110-1
> ii  firmware-bnx2             20160110-1
> ii  firmware-bnx2x            20160110-1
> ii  firmware-brcm80211        20160110-1
> ii  firmware-cavium           20160110-1
> ii  firmware-intel-sound      20160110-1
> ii  firmware-intelwimax       20160110-1
> ii  firmware-ipw2x00          20160110-1
> ii  firmware-ivtv             20160110-1
> ii  firmware-iwlwifi          20160110-1
> ii  firmware-libertas         20160110-1
> pn  firmware-linux-nonfree    <none>
> ii  firmware-misc-nonfree     20160110-1
> ii  firmware-myricom          20160110-1
> ii  firmware-netxen           20160110-1
> ii  firmware-qlogic           20160110-1
> ii  firmware-realtek          20160110-1
> ii  firmware-samsung          20160110-1
> ii  firmware-siano            20160110-1
> ii  firmware-ti-connectivity  20160110-1
> pn  xen-hypervisor            <none>
>

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Bug#838343: linux-image-4.6.0-1-amd64: allow a patch that makes elder radeon cards UltraHD ready Elmar Stellnberger <estellnb@elstel.org> - 2016-09-20 09:30 +0200
  Bug#838344: linux-image-4.6.0-1-amd64: allow a patch that makes elder radeon cards UltraHD ready Elmar Stellnberger <estellnb@elstel.org> - 2016-09-20 09:40 +0200
  Bug#838343: linux-image-4.6.0-1-amd64: allow a patch that makes elder radeon cards UltraHD ready Ben Hutchings <ben@decadent.org.uk> - 2016-09-21 02:00 +0200

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