MGA Fixes: #3895
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MGA Fixes: #3895
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1. LFB access is now done properly through the right svga_read/write linear calls. 2. Lowres 8bpp mode and Packed/Extended 8bpp+ mode don't mix together, fixes Debian Woody matroxfb module when testing the modes while keeping other compatibility intact (basically enable packed stuff only when gdcreg5 bits 5-6 are 0 when extended mode is set). 3. Small cleanup in the line accel stuff.
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