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Prior to suspend, we allocate and switch to a new VT; after suspend, we switch back to the original VT. This can be slow, and is completely unnecessary if the framebuffer we're using can restore video properly. This adds a hook that allows drivers to select whether or not to do this vt switch, and changes the gxfb driver to call this hook. It also adds a module param to gxfb to allow controlling of the vt switch (defaulting to no switch). (Note: I'm not convinced that console_sem is the best way to protect this, but we should probably have some form of locking..) [akpm@linux-foundation.org: build fix] Signed-off-by: Andres Salomon <dilinger@debian.org> Cc: Jordan Crouse <jordan.crouse@amd.com> Cc: "Antonino A. Daplas" <adaplas@pol.net> Cc: Pavel Machek <pavel@ucw.cz> Cc: "Rafael J. Wysocki" <rjw@sisk.pl> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
53 lines
1.2 KiB
Plaintext
53 lines
1.2 KiB
Plaintext
[This file is cloned from VesaFB/aty128fb]
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What is gxfb?
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=================
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This is a graphics framebuffer driver for AMD Geode GX2 based processors.
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Advantages:
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* No need to use AMD's VSA code (or other VESA emulation layer) in the
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BIOS.
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* It provides a nice large console (128 cols + 48 lines with 1024x768)
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without using tiny, unreadable fonts.
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* You can run XF68_FBDev on top of /dev/fb0
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* Most important: boot logo :-)
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Disadvantages:
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* graphic mode is slower than text mode...
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How to use it?
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==============
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Switching modes is done using gxfb.mode_option=<resolution>... boot
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parameter or using `fbset' program.
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See Documentation/fb/modedb.txt for more information on modedb
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resolutions.
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X11
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===
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XF68_FBDev should generally work fine, but it is non-accelerated.
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Configuration
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=============
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You can pass kernel command line options to gxfb with gxfb.<option>.
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For example, gxfb.mode_option=800x600@75.
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Accepted options:
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mode_option - specify the video mode. Of the form
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<x>x<y>[-<bpp>][@<refresh>]
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vram - size of video ram (normally auto-detected)
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vt_switch - enable vt switching during suspend/resume. The vt
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switch is slow, but harmless.
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--
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Andres Salomon <dilinger@debian.org>
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