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The ast driver matches DRM display modes against an internal list of modes supported by the VBIOS. Matching H/V sync flags between modes is preferred, but optional. If sync flags are not matching, the driver would program the VBIOS settings to hardware and let the display handle the difference. DRM modes are generated from attached displays or standard mode lines. Therefore differences to the VBIOS modes are not just cosmetical, but signal possible incompatibility with the display hardware. Hence make matching H/V sync flags mandatory. If the VBIOS does not support a certain mode, we should report it as unsupported. Note that the VBIOS mode tables all appear to refer to standard modes. (If sync flags really make no difference to the VBIOS, the ast driver shouldn't match them in the first place.) Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20250131092257.115596-8-tzimmermann@suse.de |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.